AK4640_05 Datasheet, PDF (12/78 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4640]
Parameter
min
typ
max
Units
Headphone-Amp Characteristics: R_L=22.8Ω, DAC → HPL/HPR pins, DATT=0dB
Output Voltage (Note 8)
1.54
1.92
2.30
Vpp
S/(N+D)
(−3dBFS)
60
70
-
dBFS
S/N
(A-weighted)
80
90
-
dB
Interchannel Isolation
70
85
-
dB
Interchannel Gain Mismatch
-
0.1
0.5
dB
Load Resistance
20
-
-
Ω
Load Capacitance
(C1 in Figure 2)
(C2 in Figure 2)
-
-
30
pF
-
-
300
pF
Speaker-Amp Characteristics: R_L=8Ω, BTL, DAC → MOUT2 pin → MIN pin → SPP/SPN pins, ALC2=OFF
Output Voltage
(−3dBFS)
2.47
3.09
3.71
Vpp
(Note 9)
(0dBFS)
-
4.38
-
Vpp
(−3dBFS, Po=150mW)
50
64
-
dB
S/(N+D)
(0dBFS, Po=300mW)
-
20
-
dB
(ALC2=ON, Po=250mW)
-
60
-
dB
S/N
(A-weighted)
82
90
-
dB
Load Resistance
8
-
-
Ω
Load Capacitance
-
-
30
pF
BEEP Input: BEEPL, BEEPR, BEEPM pins
Maximum Input Voltage (Note 10)
-
1.98
-
Vpp
Output Voltage (Input Voltage=0.3Vpp, External Input Resistance=10kΩ)
BEEPL Æ HPL
BEEPR Æ HPR
0.25
0.5
BEEPL Æ SPP/N (BEEPR=No signal)
BEEPR Æ SPP/N (BEEPL=No signal)
0.4
0.8
BEEPM Æ HPL
BEEPM Æ HPR
0.025
0.05
BEEPM Æ SPP/N
0.67
1.34
0.75
Vpp
1.2
Vpp
0.075
Vpp
2.01
Vpp
Note 8. Output voltage is proportional to AVDD voltage. Vout = 0.582 x AVDD(typ).
Note 9. Output voltage is proportional to AVDD voltage. Vout = 0.936 x AVDD(typ)@−3dBFS at Full-differential
output.
Note 10. BEEP-AMP can’t output more than this maximum voltage.
HP-Amp
HPL/HPR pin
47µF
> 6.8Ω
C1
C2 ^16Ω
Figure 2. Headphone-amp output circuit
MS0273-E-02
- 12 -
2005/04